Structural study of nanosized yttrium-doped CaMnO3 perovskites

Bulletin of materials science

D Zagorac²  B Matovic¹  A Radosavljevic-Mihajlovic¹  J Zagorac¹  A Zarubica³ 

[1] Materials Science Laboratory, Institute of Nuclear Sciences Vinca, Belgrade University, P. O. Box 522, 11001 Belgrade, Serbia$$Materials Science Laboratory, Institute of Nuclear Sciences Vinca, Belgrade University, P. O. Box 522, 11001 Belgrade, SerbiaMaterials Science Laboratory, Institute of Nuclear Sciences Vinca, Belgrade University, P. O. Box 522, 11001 Belgrade, Serbia$$;Max Planck Institute for Solid State Research, Heisenbergstr. 1, 70569, Stuttgart, Germany$$Max Planck Institute for Solid State Research, Heisenbergstr. 1, 70569, Stuttgart, GermanyMax Planck Institute for Solid State Research, Heisenbergstr. 1, 70569, Stuttgart, Germany$$;Department of Chemistry, University of Nis, Visegradska 33, 18000 Nis, Serbia$$Department of Chemistry, University of Nis, Visegradska 33, 18000 Nis, SerbiaDepartment of Chemistry, University of Nis, Visegradska 33, 18000 Nis, Serbia$$

关键词: Nanostructures;    ceramics;    photoelectron spectroscopy;    X-ray diffraction;    crystal structure.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

Nanostructured compounds with general formula Ca_{1-ð‘�?}Y_ð‘�?MnO₃ (0 â‰�? ð‘�? â‰�? 1) were synthesized by modified glycine nitrate procedure. In the next step, we have investigated crystal structure and microstructure of the synthesized samples using X-ray methods and Rietveld analysis. Focus of this research was the structural stability of the yttrium-doped CaMnO₃ perovskite phases, which crystallize in orthorhombic space group Pnma. We observed that the unit cell volumes of the investigated compounds increase proportionally with yttrium amount. Furthermore, we investigated the influence of yttrium amount on Mnâ€�?�O bond angles and distances, tilting of MnO₆ octahedra and deformation due to the presence of Jahnâ€�?�Teller distortion around Mn³⁺ cation. In order to estimate effective coordination of 𝐴 and 𝐵 sites, bond valence calculations (BVC) were performed for 𝐴 and 𝐵 site cations. Finally, the photoelectron spectroscopy (XPS) method was applied in order to follow yttrium concentration in the perovskite phases.

【 授权许可】

Unknown